How do you start "Under New Management"

[Robber N0T from here]

Yes, I completed all the main quests in the to the point of killin Mercer Thieves Guild, and yes, I've done a bunch of Delvin and Vex quests, but how do you trigger that quest exactly? Online forums are being kinda vauge about this, but I think there was something about completing quests in each major city? But if so, than what quest specifically do you need to complete at those cities? One of Delvin's? But which one? Fishing, Bendlem or Books one? What am I missing?

[Stormsong]

As you do misc Delvin and Vex quests the number completed for a hold is tracked. Once you reach a threshold (I think its 5) misc quests in a hold, someone important from that hold will set up a job through dlDelvin. Its completion will put that city in your pocket, adding wealth to the Guild and give you benefits like those a thriving guild enjoys in Riften in that new hold as well.

[Rez Elwin]

As said above, 5 quests in a city will unlock a special job from Delvin. There are 4 special jobs and you need to do each one. The cities are Whiterun, Solitude, Windhelm, and Markarth. You

can expedite the process by only taking jobs in those 4 cities and taking two jobs at once from both Vex and Delvin and make sure they are both in the same city, you can quit a job without any repercussions as many times as you want.

After finishing all 4 jobs talk to Brynjolf, after the ceremony talk to Tonilia for your Guild Master armor. Also make sure to check the chest near the guild master's desk, it has the unique Amulet of Articulation.